make signing with libsecp256k1 the default #14
Merged
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libsecp256k1 becomes hard dependency - won't load without it.
sign_compact (used by SignMessage) and recover_compact (used by VerifyMessage) now also uses libsecp256k1
signing with openssl is still possible using sign_with_openssl()
and sign_compact_with_openssl()
added call to secp256k1_context_randomize(), this protects from potential
future side channel attacks.